Casing for electrical apparatus



March 10. 1925.

E. A. WAGNER CASING FOR ELECTRICAL APPARATUS FiTed Nov. 11, 1920 Fig 4.

Fig.1

Fig 5.

Inventor": Edward A.Wa? ner;

I by fi ng Hi 5 Attorn ey.

Patented Mar. 10, 1925.

UNITED STATES PATENT OFFICE.

EDWARD A. WAGNER. 013 FORT WnYI'Tl-I INDLANA. ASSIGNOR TO GENERAL ELECTRIC COMPANY, 11. CORPORATEON OF NE? YORK.

CASING FOR ELECTRICAL APPARATUS.

Application filed November 11, 1920.

To all who! it may oncern:

Be it known that I, EDWARD A. WAGNER, i citizen of the United States, residing at Fort 'avne, count of Allen. State of Indiana. have invented certain new and useful improvements in Casings for Electrical Apparatus. of which the following is a speciiication.

My invention relates to casings for electrical apparatus adapted to be submerged in oil. such as transformers and the like. and his for its object an improved arrangement it parts which is light and economical to m nufmture and at the same time possesses nz ahunical strength sufficient to support adequately the Weight of the encased electrical apparatus.

it has been the practice generally to house transformers and the like designed for supply service in asings of cast metal. tor instance cast iron. he use 01' cast metal Casi s for this type of ehn-trieal apparatus is not \a'holl satisfactory for a number of reas is: ch ef among which may he mentioned tl t dltiiclllt) in obtaining mstings uniforml non-porous and oil-tight. the expense inwhed in iii.-iintaining a sutlieient moiety of patterns and molders flasks to supply the desired \aricty of castings. and the disproportionately large dead Weight of lnetal in tle asings to that in the apparatus itself hit-h it is necessary to support and transort where cast natal ca ings are used.

in the practice of my intention these ohc thins are entirely obviated hecause I make we of sheet metal casings which are coni'ructcd mainly of parts Welded together. light parts heing largely employed l ecause 1 support the whole weight of the encased apparatus from the sides. thus relieving the bottom from the shearing strains otherwise impressed hv the Weight of the encased apparatus.

For a more complete understanding of the nature and objects of my invention. refereice should he had 130 the following detailed description taken in connection with the accompaming drawing in which:

F g. 1 is a vertical section of a tank or casiiig tor a supplv transformer constructed in in'cot'datnje with my invention: Fig. 2 is a top plan view of the tank shown in Fig. 1: Fl 3 shows in perspective a detail in the tianitonizer supporting means employed in Serial No. 423,468.

the tank shoa n in Figs. 1 and 2; Fig. 4 is a vertical section of a modified form of tank embodving my inventi n; and Fig. 5 shows a detail in the transformer supportingmeans employed in this modilied form of tank.

Referring now to the drawing, 10 denotes the body portion of the tank or casing for a transformer 11, indicated by broken lines. The casing is shown without the usual cover. which is substantially square in shape in order to tit snugly on the top band 12 secured about the upper end of the tank.

The body portion of the tank does not follow the generally square outline of the top-band 12. hot is bent along vertical lines so as to conform to the generally cruciform contour indicated in the plan in Fig. 2. thereby providing corner pockets 13. 14. 15 and 16 inside the top-hand. the bottoms of which are closed by perforated inserted pieces. as indicated at 17 in Fig. 1. These inserted pieces are secured in place preferably by welding and are provid d with one or more perforations of any suitable shape to receive and support the insulating bushings (not shown) through which the electrical coinluttors leading to the transformer 11 pass. In order that the conductors ma readily pass from he transformer into the pockets 3. 11. 15 anl 16. a suitable notch is cut in the top of the wall of the body nor tion 10. as indicated at 18 in Figs. 1 and 2.

The bottom portion 18 is preferably so cured to the body portion by welding and need be thick enough merely to support the Weight of oil or other c oling medium contained n the tank and in which die con tained electrical apparatu is suhnn-rged.

The means for supporting the transformer 11 from the s de walls (I the tank. in the form of my invention shown in 1 and 2. comprise a pair of channel mem ers 21 the bottom ends of which are closed by an inserted piece 31 nhieh is clearly illustrated in Fig. 1 These channel members 20 are secured in any suitable manner (as by spot: Welding) to opposite sides of the tank and are adapted to engage with the outside legs 0f the core of the transformer 11. The transformer ll is here indicatol as of the distributed i'ole type harinr. fou outer legs. two oppositely disposed ones hein adapted to slide in the channel memb rs so and rest upon the inserted pieces in the ends. 1t

Will of course be understood that Where the transformer is of a different type the channel members 20 will have a correspondingly difflerent disposition about the walls of the tan In order that the Weight of the trans former may be borne as a pure shearing strain by the securing means Without tensile strains tending to pull the members 20 away from the walls of the tank, the members 20 are extended and securely welded to the casing walls above the upper part of the transformer, increased strength being thus secured.

In the form of my invention shown in Fig. 4, the wall of the body portion 30 of the tank is made of corrugated sheet metal instead of plain metal in order that the walls may be stiff in both a lateral as well as in a transverse or vertical direction when bent to have the required configuration. The outline of the encased transformer is indicated by the broken line 31 in the tank, the latter having a top-band 32 which is offset from the contour of the body portion 30 to form the pockets as at 33 and 34. These pockets have perforated bottoms inscrted as indicated at 37, the top of the wall of the tank being notched, as at 38, to provide easy passage of the conductors from the transformer at 31 into the pockets which contain bushings (not shown).

A pair of angle members 40, secured to the tank wall at opposite sides, here comprises the means for supporting the transformer 31. These angle members have inserted pieces 41 secured to their respective lower ends and are disposed with respect to each other on the wall of the tank so that they form what is in effect a pair of oppositely disposed channel members in which the outside legs of the core of the transformer 31 may slide and rest on the inserted pieces. Here again. these members .0 are extended and securely welded to the casing walls above the upper part of the transformer to secure increased strength.

Having now described an embodiment of my invention which is at present the best means known to me for carrying the same into effect, I would have it understood that this is merely iilustrative and that I do not mean to be limited thereby to the precise details shown, nor restricted in the choice of recognized equivalents except as defined in my claim hereunto annexed.

What I claim as new and desire to secure by Letters Patent of the United States, is:

A. casing for a transform-er, said casing comprising sheet metal bottom and wall portions and being provided with vertically disposed channel members on the inner 8111'- faces of its walls, said channel members being formed to engage the transformer and having their lower ends closed to provide supports therefor, the upper ends of the channel members being extended and weld-- ed to the casing walls above the upper part of said transformer.

In witness whereof. I have hereunto set my hand this 8th day of November, 1920.

EDWARD A. WAGNER. 

